| 微间隙焊缝磁光成像检测方法 |
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| 引用本文： | 高向东,甄任贺.微间隙焊缝磁光成像检测方法[J].焊接学报,2014,35(4):11-14. |
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| 作者姓名： | 高向东 甄任贺 |
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| 作者单位： | 1.广东工业大学机电工程学院, 广州 510006 |
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| 基金项目： | 国家自然科学基金资助项目(51175095);广东省自然科学基金资助项目(10251009001000001);广东省学科建设科技创新项目(2013KJCX0063) |
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| 摘 要： | 针对激光焊接紧密对接微间隙(0~0.1 mm)焊缝,研究一种基于法拉第磁光效应成像的焊缝检测新方法.以碳钢平板对接激光焊为试验对象,采用磁场激励器使焊件感应磁性并在焊缝处改变磁场分布,磁光传感器置于待测焊缝上方,不同磁场强度将导致磁光传感器偏振光不同角度的旋转,形成反映焊缝位置特征的磁光图像.对焊缝磁光图像进行滤波去噪、灰度转换以及形态学等处理,快速准确地提取出焊缝中心位置.结果表明,磁光图像能够有效反映微间隙焊缝位置,可以获得较高的测量精度,为解决微间隙焊缝检测和跟踪问题提供了一条有效途径.
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| 关 键 词： | 磁光成像 微间隙焊缝 激光焊接 |
| 收稿时间： | 2013/9/9 0:00:00 |
A method to detect micro weld gap based on magneto-optical imaging |
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| GAO Xiangdong and ZHEN Renhe.A method to detect micro weld gap based on magneto-optical imaging[J].Transactions of The China Welding Institution,2014,35(4):11-14. |
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| Authors: | GAO Xiangdong and ZHEN Renhe |
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| Affiliation: | 1.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China2.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;School of Automation, Guangdong Polytechnic Normal University, Guangzhou 510635, China |
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| Abstract: | A new method was developed to detect the micro weld gap (0-0.1 mm) during laser welding,based on Faraday magneto-optical effect imaging. During laser butt-welding of carbon steel,a magnetic excitation device was used to magnetize the weldment. It was found that the magnetic field distribution in the weld zone was different from other zones. A magneto-optical sensor was placed upon the magnetized weldment to obtain the magneto-optical images of the weld. Different magnetic field intensities would lead to rotation of the polarized light of magnetooptical sensor in different directions,and the magneto-images consisting of the joint position feature could be captured. By using image-processing methods, such as median filtering, grayscale transform,threshold segmentation and morphology,the micro weld gap center could be extracted rapidly from a magnetooptical image. The experimental results show that the magnetooptical images could effectively and accurately reflect the position of micro weld gap. The proposed method provides a novel approach for automatic identification and tracking of the micro weld gap during laser welding. |
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| Keywords: | magneto-optical imaging micro weld gap laser welding |
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